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Simplifying X + (x + -12) + (x + -9) = 135 Reorder the terms: X + (-12 + x) + (x + -9) = 135 Remove parenthesis around (-12 + x) X + -12 + x + (x + -9) = 135 Reorder the terms: X + -12 + x + (-9 + x) = 135 Remove parenthesis around (-9 + x) X + -12 + x + -9 + x = 135 Reorder the terms: -12 + -9 + X + x + x = 135 Combine like terms: -12 + -9 = -21 -21 + X + x + x = 135 Combine like terms: x + x = 2x -21 + X + 2x = 135 Solving -21 + X + 2x = 135 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '21' to each side of the equation. -21 + X + 21 + 2x = 135 + 21 Reorder the terms: -21 + 21 + X + 2x = 135 + 21 Combine like terms: -21 + 21 = 0 0 + X + 2x = 135 + 21 X + 2x = 135 + 21 Combine like terms: 135 + 21 = 156 X + 2x = 156 Add '-2x' to each side of the equation. X + 2x + -2x = 156 + -2x Combine like terms: 2x + -2x = 0 X + 0 = 156 + -2x X = 156 + -2x Simplifying X = 156 + -2x
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